72126947 has 2 divisors, whose sum is σ = 72126948. Its totient is φ = 72126946.

The previous prime is 72126889. The next prime is 72126959. The reversal of 72126947 is 74962127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72126947 - 2¹² = 72122851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72126947.

It is not a weakly prime, because it can be changed into another prime (72126547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36063473 + 36063474.

It is an arithmetic number, because the mean of its divisors is an integer number (36063474).

Almost surely, 2^72126947 is an apocalyptic number.

72126947 is a deficient number, since it is larger than the sum of its proper divisors (1).

72126947 is an equidigital number, since it uses as much as digits as its factorization.

72126947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 72126947 is about 8492.7585035723. The cubic root of 72126947 is about 416.2611214252.

The spelling of 72126947 in words is "seventy-two million, one hundred twenty-six thousand, nine hundred forty-seven".